diff --git a/categories/forms.py b/categories/forms.py
index c25f26f..3f0ae02 100644
--- a/categories/forms.py
+++ b/categories/forms.py
@@ -13,9 +13,9 @@ class CategoryForm(forms.ModelForm):
     def clean_name(self):
         name = self.cleaned_data.get('name')
         if self.instance.id:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name).exclude(id = self.instance.id)
+            same_name = Category.objects.filter(name__unaccent__iexact = name).exclude(id = self.instance.id)
         else:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name)
+            same_name = Category.objects.filter(name__unaccent__iexact = name)
 
         if same_name.count() > 0:
             self._errors['name'] = [_('There is another category with this name, try another one.')]
--
libgit2 0.21.2